Not to bring this post back from the dead but I seem to be having this problem for a different website I have again.
I enter the username and password for my RT account and I get "A username and password must be entered."
Not sure why but I did install the most recent 1.0.8 and not sure what is causing this. I thought updating the plugin would have helped but this time it's doing nothing.
I don't like this authentication at all
Sometimes authentication is cut automatically, which causes questions from my client, and of course he does not know my login credentials for the RT site
If authentication will not be not removed, I will not renew my subscription. There are a lot of other designers around.